Bug 696334 (CVE-2011-0285)

Summary:	CVE-2011-0285 krb5: kadmind invalid pointer free() (MITKRB5-SA-004)
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dpal, jplans, jrusnack, nalin, prc
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-03-15 03:59:22 UTC	Type:	---
Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	696341, 696342, 696343
Bug Blocks:

Description Vincent Danen 2011-04-13 20:39:51 UTC

A bug was discovered [1],[2] in the password-changing capability of the MIT krb5 administration daemon (kadmind) that can cause it to attempt to free() an invalid pointer under certain error conditions.  This could allow an unauthenticated remote attacker to cause the kadmind process to terminate, resulting in a denial of service.

Only krb5 1.7 and higher are vulnerable to this flaw; earlier releases to do not contain the functionality that the vulnerable code implements.

Upcoming krb5 releases will correct the flaw, but patches are available for 1.7.x/1.8.x [3] and 1.9.x [4].

[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=621726
[2] http://web.mit.edu/Kerberos/advisories/MITKRB5-SA-2011-004.txt
[3] http://web.mit.edu/kerberos/advisories/2011-004-patch-r18.txt
[4] http://web.mit.edu/kerberos/advisories/2011-004-patch.txt

Comment 4 Vincent Danen 2011-04-13 21:02:43 UTC

Created krb5 tracking bugs for this issue

Affects: fedora-all [bug 696343]

Comment 6 Vincent Danen 2011-04-14 01:14:16 UTC

Glibc protections turn an invalid-free into a crash-only (no arbitrary code execution).

Comment 7 errata-xmlrpc 2011-04-14 18:16:34 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:0447 https://rhn.redhat.com/errata/RHSA-2011-0447.html

Comment 8 Vincent Danen 2013-03-15 03:59:22 UTC

Statement:

This issue did not affect the versions of krb5 as shipped with Red Hat Enterprise Linux 5.